Well, I went for it. I kept wondering if 8 sleeves of Callaways wasn't a better use of credits but WTF, it was on special offer. Buy one, get a cup of disgusting pro shop coffee free, so couldn't resist.
Going by the few putts I've taken with it so far it seems very similar to the L66 one, maybe a bit hotter but I was knocking around on Oakmont greens to get a feel for it so maybe that had something to do with how far the ball seemed to go.
Only time will tell but so far it seems not to have been the waste of money the Method was.